In March 2010, Americans conducted 15.4 billion core searches, with Google Sites accounting for 65.1 percent search market share, according to comScore's monthly qSearch analysis of the U.S. search marketplace.

Google Sites led the U.S. core search market in March with 65.1 percent of the searches conducted, followed by Yahoo! Sites (16.9 percent), and Microsoft Sites (11.7 percent). Ask Network captured 3.8 percent of the search market, followed by AOL LLC with 2.5 percent.

In the March analysis of the top properties where search activity is observed, Google Sites led the search market with 14.3 billion search queries, followed by Yahoo! Sites with 2.7 billion queries and Microsoft Sites with 1.9 billion. Facebook.com experienced significant growth during the month with a 48-percent increase to 647 million searches, jumping one position in the ranking.